The Claas 0021638940 is a genuine OEM adjustment washer designed for precise spacing and alignment in various Claas agricultural machines. This washer features an inner diameter of 25 mm, an outer diameter of 35 mm, and a thickness of 0.5 mm, ensuring optimal fit and function. It is a critical component for maintaining proper clearances and reducing wear in demanding applications across Claas tractors, combines, forage harvesters, balers, and telehandlers.